source3/libsmb/clireadwrite.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    client file read/write routines
   4    Copyright (C) Andrew Tridgell 1994-1998
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "libsmb/libsmb.h"
  22 #include "../lib/util/tevent_ntstatus.h"
  23 #include "async_smb.h"
  24 #include "trans2.h"
  25
  26 /****************************************************************************
  27   Calculate the recommended read buffer size
  28 ****************************************************************************/
  29 static size_t cli_read_max_bufsize(struct cli_state *cli)
  30 {
  31         size_t data_offset = smb_size - 4;
  32         size_t wct = 12;
  33
  34         size_t useable_space;
  35
  36         if (!client_is_signing_on(cli) && !cli_encryption_on(cli)
  37             && (cli->server_posix_capabilities & CIFS_UNIX_LARGE_READ_CAP)) {
  38                 return CLI_SAMBA_MAX_POSIX_LARGE_READX_SIZE;
  39         }
  40         if (cli->capabilities & CAP_LARGE_READX) {
  41                 return cli->is_samba
  42                         ? CLI_SAMBA_MAX_LARGE_READX_SIZE
  43                         : CLI_WINDOWS_MAX_LARGE_READX_SIZE;
  44         }
  45
  46         data_offset += wct * sizeof(uint16_t);
  47         data_offset += 1; /* pad */
  48
  49         useable_space = cli->max_xmit - data_offset;
  50
  51         return useable_space;
  52 }
  53
  54 /****************************************************************************
  55   Calculate the recommended write buffer size
  56 ****************************************************************************/
  57 static size_t cli_write_max_bufsize(struct cli_state *cli,
  58                                     uint16_t write_mode,
  59                                     uint8_t wct)
  60 {
  61         if (write_mode == 0 &&
  62             !client_is_signing_on(cli) &&
  63             !cli_encryption_on(cli) &&
  64             (cli->server_posix_capabilities & CIFS_UNIX_LARGE_WRITE_CAP) &&
  65             (cli->capabilities & CAP_LARGE_FILES)) {
  66                 /* Only do massive writes if we can do them direct
  67                  * with no signing or encrypting - not on a pipe. */
  68                 return CLI_SAMBA_MAX_POSIX_LARGE_WRITEX_SIZE;
  69         }
  70
  71         if (cli->is_samba) {
  72                 return CLI_SAMBA_MAX_LARGE_WRITEX_SIZE;
  73         }
  74
  75         if (((cli->capabilities & CAP_LARGE_WRITEX) == 0)
  76             || client_is_signing_on(cli)
  77             || strequal(cli->dev, "LPT1:")) {
  78                 size_t data_offset = smb_size - 4;
  79                 size_t useable_space;
  80
  81                 data_offset += wct * sizeof(uint16_t);
  82                 data_offset += 1; /* pad */
  83
  84                 useable_space = cli->max_xmit - data_offset;
  85
  86                 return useable_space;
  87         }
  88
  89         return CLI_WINDOWS_MAX_LARGE_WRITEX_SIZE;
  90 }
  91
  92 struct cli_read_andx_state {
  93         size_t size;
  94         uint16_t vwv[12];
  95         NTSTATUS status;
  96         size_t received;
  97         uint8_t *buf;
  98 };
  99
 100 static void cli_read_andx_done(struct tevent_req *subreq);
 101
 102 struct tevent_req *cli_read_andx_create(TALLOC_CTX *mem_ctx,
 103                                         struct event_context *ev,
 104                                         struct cli_state *cli, uint16_t fnum,
 105                                         off_t offset, size_t size,
 106                                         struct tevent_req **psmbreq)
 107 {
 108         struct tevent_req *req, *subreq;
 109         struct cli_read_andx_state *state;
 110         uint8_t wct = 10;
 111
 112         if (size > cli_read_max_bufsize(cli)) {
 113                 DEBUG(0, ("cli_read_andx_send got size=%d, can only handle "
 114                           "size=%d\n", (int)size,
 115                           (int)cli_read_max_bufsize(cli)));
 116                 return NULL;
 117         }
 118
 119         req = tevent_req_create(mem_ctx, &state, struct cli_read_andx_state);
 120         if (req == NULL) {
 121                 return NULL;
 122         }
 123         state->size = size;
 124
 125         SCVAL(state->vwv + 0, 0, 0xFF);
 126         SCVAL(state->vwv + 0, 1, 0);
 127         SSVAL(state->vwv + 1, 0, 0);
 128         SSVAL(state->vwv + 2, 0, fnum);
 129         SIVAL(state->vwv + 3, 0, offset);
 130         SSVAL(state->vwv + 5, 0, size);
 131         SSVAL(state->vwv + 6, 0, size);
 132         SSVAL(state->vwv + 7, 0, (size >> 16));
 133         SSVAL(state->vwv + 8, 0, 0);
 134         SSVAL(state->vwv + 9, 0, 0);
 135
 136         if ((uint64_t)offset >> 32) {
 137                 SIVAL(state->vwv + 10, 0,
 138                       (((uint64_t)offset)>>32) & 0xffffffff);
 139                 wct += 2;
 140         }
 141
 142         subreq = cli_smb_req_create(state, ev, cli, SMBreadX, 0, wct,
 143                                     state->vwv, 0, NULL);
 144         if (subreq == NULL) {
 145                 TALLOC_FREE(req);
 146                 return NULL;
 147         }
 148         tevent_req_set_callback(subreq, cli_read_andx_done, req);
 149         *psmbreq = subreq;
 150         return req;
 151 }
 152
 153 struct tevent_req *cli_read_andx_send(TALLOC_CTX *mem_ctx,
 154                                       struct event_context *ev,
 155                                       struct cli_state *cli, uint16_t fnum,
 156                                       off_t offset, size_t size)
 157 {
 158         struct tevent_req *req, *subreq;
 159         NTSTATUS status;
 160
 161         req = cli_read_andx_create(mem_ctx, ev, cli, fnum, offset, size,
 162                                    &subreq);
 163         if (req == NULL) {
 164                 return NULL;
 165         }
 166
 167         status = cli_smb_req_send(subreq);
 168         if (tevent_req_nterror(req, status)) {
 169                 return tevent_req_post(req, ev);
 170         }
 171         return req;
 172 }
 173
 174 static void cli_read_andx_done(struct tevent_req *subreq)
 175 {
 176         struct tevent_req *req = tevent_req_callback_data(
 177                 subreq, struct tevent_req);
 178         struct cli_read_andx_state *state = tevent_req_data(
 179                 req, struct cli_read_andx_state);
 180         uint8_t *inbuf;
 181         uint8_t wct;
 182         uint16_t *vwv;
 183         uint32_t num_bytes;
 184         uint8_t *bytes;
 185
 186         state->status = cli_smb_recv(subreq, state, &inbuf, 12, &wct, &vwv,
 187                                      &num_bytes, &bytes);
 188         TALLOC_FREE(subreq);
 189         if (NT_STATUS_IS_ERR(state->status)) {
 190                 tevent_req_nterror(req, state->status);
 191                 return;
 192         }
 193
 194         /* size is the number of bytes the server returned.
 195          * Might be zero. */
 196         state->received = SVAL(vwv + 5, 0);
 197         state->received |= (((unsigned int)SVAL(vwv + 7, 0)) << 16);
 198
 199         if (state->received > state->size) {
 200                 DEBUG(5,("server returned more than we wanted!\n"));
 201                 tevent_req_nterror(req, NT_STATUS_UNEXPECTED_IO_ERROR);
 202                 return;
 203         }
 204
 205         /*
 206          * bcc field must be valid for small reads, for large reads the 16-bit
 207          * bcc field can't be correct.
 208          */
 209
 210         if ((state->received < 0xffff) && (state->received > num_bytes)) {
 211                 DEBUG(5, ("server announced more bytes than sent\n"));
 212                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 213                 return;
 214         }
 215
 216         state->buf = discard_const_p(uint8_t, smb_base(inbuf)) + SVAL(vwv+6, 0);
 217
 218         if (trans_oob(smb_len(inbuf), SVAL(vwv+6, 0), state->received)
 219             || ((state->received != 0) && (state->buf < bytes))) {
 220                 DEBUG(5, ("server returned invalid read&x data offset\n"));
 221                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 222                 return;
 223         }
 224         tevent_req_done(req);
 225 }
 226
 227 /*
 228  * Pull the data out of a finished async read_and_x request. rcvbuf is
 229  * talloced from the request, so better make sure that you copy it away before
 230  * you talloc_free(req). "rcvbuf" is NOT a talloc_ctx of its own, so do not
 231  * talloc_move it!
 232  */
 233
 234 NTSTATUS cli_read_andx_recv(struct tevent_req *req, ssize_t *received,
 235                             uint8_t **rcvbuf)
 236 {
 237         struct cli_read_andx_state *state = tevent_req_data(
 238                 req, struct cli_read_andx_state);
 239         NTSTATUS status;
 240
 241         if (tevent_req_is_nterror(req, &status)) {
 242                 return status;
 243         }
 244         *received = state->received;
 245         *rcvbuf = state->buf;
 246         return NT_STATUS_OK;
 247 }
 248
 249 struct cli_readall_state {
 250         struct tevent_context *ev;
 251         struct cli_state *cli;
 252         uint16_t fnum;
 253         off_t start_offset;
 254         size_t size;
 255         size_t received;
 256         uint8_t *buf;
 257 };
 258
 259 static void cli_readall_done(struct tevent_req *subreq);
 260
 261 static struct tevent_req *cli_readall_send(TALLOC_CTX *mem_ctx,
 262                                            struct event_context *ev,
 263                                            struct cli_state *cli,
 264                                            uint16_t fnum,
 265                                            off_t offset, size_t size)
 266 {
 267         struct tevent_req *req, *subreq;
 268         struct cli_readall_state *state;
 269
 270         req = tevent_req_create(mem_ctx, &state, struct cli_readall_state);
 271         if (req == NULL) {
 272                 return NULL;
 273         }
 274         state->ev = ev;
 275         state->cli = cli;
 276         state->fnum = fnum;
 277         state->start_offset = offset;
 278         state->size = size;
 279         state->received = 0;
 280         state->buf = NULL;
 281
 282         subreq = cli_read_andx_send(state, ev, cli, fnum, offset, size);
 283         if (tevent_req_nomem(subreq, req)) {
 284                 return tevent_req_post(req, ev);
 285         }
 286         tevent_req_set_callback(subreq, cli_readall_done, req);
 287         return req;
 288 }
 289
 290 static void cli_readall_done(struct tevent_req *subreq)
 291 {
 292         struct tevent_req *req = tevent_req_callback_data(
 293                 subreq, struct tevent_req);
 294         struct cli_readall_state *state = tevent_req_data(
 295                 req, struct cli_readall_state);
 296         ssize_t received;
 297         uint8_t *buf;
 298         NTSTATUS status;
 299
 300         status = cli_read_andx_recv(subreq, &received, &buf);
 301         if (tevent_req_nterror(req, status)) {
 302                 return;
 303         }
 304
 305         if (received == 0) {
 306                 /* EOF */
 307                 tevent_req_done(req);
 308                 return;
 309         }
 310
 311         if ((state->received == 0) && (received == state->size)) {
 312                 /* Ideal case: Got it all in one run */
 313                 state->buf = buf;
 314                 state->received += received;
 315                 tevent_req_done(req);
 316                 return;
 317         }
 318
 319         /*
 320          * We got a short read, issue a read for the
 321          * rest. Unfortunately we have to allocate the buffer
 322          * ourselves now, as our caller expects to receive a single
 323          * buffer. cli_read_andx does it from the buffer received from
 324          * the net, but with a short read we have to put it together
 325          * from several reads.
 326          */
 327
 328         if (state->buf == NULL) {
 329                 state->buf = talloc_array(state, uint8_t, state->size);
 330                 if (tevent_req_nomem(state->buf, req)) {
 331                         return;
 332                 }
 333         }
 334         memcpy(state->buf + state->received, buf, received);
 335         state->received += received;
 336
 337         TALLOC_FREE(subreq);
 338
 339         if (state->received >= state->size) {
 340                 tevent_req_done(req);
 341                 return;
 342         }
 343
 344         subreq = cli_read_andx_send(state, state->ev, state->cli, state->fnum,
 345                                     state->start_offset + state->received,
 346                                     state->size - state->received);
 347         if (tevent_req_nomem(subreq, req)) {
 348                 return;
 349         }
 350         tevent_req_set_callback(subreq, cli_readall_done, req);
 351 }
 352
 353 static NTSTATUS cli_readall_recv(struct tevent_req *req, ssize_t *received,
 354                                  uint8_t **rcvbuf)
 355 {
 356         struct cli_readall_state *state = tevent_req_data(
 357                 req, struct cli_readall_state);
 358         NTSTATUS status;
 359
 360         if (tevent_req_is_nterror(req, &status)) {
 361                 return status;
 362         }
 363         *received = state->received;
 364         *rcvbuf = state->buf;
 365         return NT_STATUS_OK;
 366 }
 367
 368 struct cli_pull_subreq {
 369         struct tevent_req *req;
 370         ssize_t received;
 371         uint8_t *buf;
 372 };
 373
 374 /*
 375  * Parallel read support.
 376  *
 377  * cli_pull sends as many read&x requests as the server would allow via
 378  * max_mux at a time. When replies flow back in, the data is written into
 379  * the callback function "sink" in the right order.
 380  */
 381
 382 struct cli_pull_state {
 383         struct tevent_req *req;
 384
 385         struct event_context *ev;
 386         struct cli_state *cli;
 387         uint16_t fnum;
 388         off_t start_offset;
 389         SMB_OFF_T size;
 390
 391         NTSTATUS (*sink)(char *buf, size_t n, void *priv);
 392         void *priv;
 393
 394         size_t chunk_size;
 395
 396         /*
 397          * Outstanding requests
 398          */
 399         int num_reqs;
 400         struct cli_pull_subreq *reqs;
 401
 402         /*
 403          * For how many bytes did we send requests already?
 404          */
 405         SMB_OFF_T requested;
 406
 407         /*
 408          * Next request index to push into "sink". This walks around the "req"
 409          * array, taking care that the requests are pushed to "sink" in the
 410          * right order. If necessary (i.e. replies don't come in in the right
 411          * order), replies are held back in "reqs".
 412          */
 413         int top_req;
 414
 415         /*
 416          * How many bytes did we push into "sink"?
 417          */
 418
 419         SMB_OFF_T pushed;
 420 };
 421
 422 static char *cli_pull_print(struct tevent_req *req, TALLOC_CTX *mem_ctx)
 423 {
 424         struct cli_pull_state *state = tevent_req_data(
 425                 req, struct cli_pull_state);
 426         char *result;
 427
 428         result = tevent_req_default_print(req, mem_ctx);
 429         if (result == NULL) {
 430                 return NULL;
 431         }
 432
 433         return talloc_asprintf_append_buffer(
 434                 result, "num_reqs=%d, top_req=%d",
 435                 state->num_reqs, state->top_req);
 436 }
 437
 438 static void cli_pull_read_done(struct tevent_req *read_req);
 439
 440 /*
 441  * Prepare an async pull request
 442  */
 443
 444 struct tevent_req *cli_pull_send(TALLOC_CTX *mem_ctx,
 445                                  struct event_context *ev,
 446                                  struct cli_state *cli,
 447                                  uint16_t fnum, off_t start_offset,
 448                                  SMB_OFF_T size, size_t window_size,
 449                                  NTSTATUS (*sink)(char *buf, size_t n,
 450                                                   void *priv),
 451                                  void *priv)
 452 {
 453         struct tevent_req *req;
 454         struct cli_pull_state *state;
 455         int i;
 456
 457         req = tevent_req_create(mem_ctx, &state, struct cli_pull_state);
 458         if (req == NULL) {
 459                 return NULL;
 460         }
 461         tevent_req_set_print_fn(req, cli_pull_print);
 462         state->req = req;
 463
 464         state->cli = cli;
 465         state->ev = ev;
 466         state->fnum = fnum;
 467         state->start_offset = start_offset;
 468         state->size = size;
 469         state->sink = sink;
 470         state->priv = priv;
 471
 472         state->pushed = 0;
 473         state->top_req = 0;
 474
 475         if (size == 0) {
 476                 tevent_req_done(req);
 477                 return tevent_req_post(req, ev);
 478         }
 479
 480         state->chunk_size = cli_read_max_bufsize(cli);
 481
 482         state->num_reqs = MAX(window_size/state->chunk_size, 1);
 483         state->num_reqs = MIN(state->num_reqs, cli->max_mux);
 484
 485         state->reqs = talloc_zero_array(state, struct cli_pull_subreq,
 486                                         state->num_reqs);
 487         if (state->reqs == NULL) {
 488                 goto failed;
 489         }
 490
 491         state->requested = 0;
 492
 493         for (i=0; i<state->num_reqs; i++) {
 494                 struct cli_pull_subreq *subreq = &state->reqs[i];
 495                 SMB_OFF_T size_left;
 496                 size_t request_thistime;
 497
 498                 if (state->requested >= size) {
 499                         state->num_reqs = i;
 500                         break;
 501                 }
 502
 503                 size_left = size - state->requested;
 504                 request_thistime = MIN(size_left, state->chunk_size);
 505
 506                 subreq->req = cli_readall_send(
 507                         state->reqs, ev, cli, fnum,
 508                         state->start_offset + state->requested,
 509                         request_thistime);
 510
 511                 if (subreq->req == NULL) {
 512                         goto failed;
 513                 }
 514                 tevent_req_set_callback(subreq->req, cli_pull_read_done, req);
 515                 state->requested += request_thistime;
 516         }
 517         return req;
 518
 519 failed:
 520         TALLOC_FREE(req);
 521         return NULL;
 522 }
 523
 524 /*
 525  * Handle incoming read replies, push the data into sink and send out new
 526  * requests if necessary.
 527  */
 528
 529 static void cli_pull_read_done(struct tevent_req *subreq)
 530 {
 531         struct tevent_req *req = tevent_req_callback_data(
 532                 subreq, struct tevent_req);
 533         struct cli_pull_state *state = tevent_req_data(
 534                 req, struct cli_pull_state);
 535         struct cli_pull_subreq *pull_subreq = NULL;
 536         NTSTATUS status;
 537         int i;
 538
 539         for (i = 0; i < state->num_reqs; i++) {
 540                 pull_subreq = &state->reqs[i];
 541                 if (subreq == pull_subreq->req) {
 542                         break;
 543                 }
 544         }
 545         if (i == state->num_reqs) {
 546                 /* Huh -- received something we did not send?? */
 547                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 548                 return;
 549         }
 550
 551         status = cli_readall_recv(subreq, &pull_subreq->received,
 552                                   &pull_subreq->buf);
 553         if (!NT_STATUS_IS_OK(status)) {
 554                 tevent_req_nterror(state->req, status);
 555                 return;
 556         }
 557
 558         /*
 559          * This loop is the one to take care of out-of-order replies. All
 560          * pending requests are in state->reqs, state->reqs[top_req] is the
 561          * one that is to be pushed next. If however a request later than
 562          * top_req is replied to, then we can't push yet. If top_req is
 563          * replied to at a later point then, we need to push all the finished
 564          * requests.
 565          */
 566
 567         while (state->reqs[state->top_req].req != NULL) {
 568                 struct cli_pull_subreq *top_subreq;
 569
 570                 DEBUG(11, ("cli_pull_read_done: top_req = %d\n",
 571                            state->top_req));
 572
 573                 top_subreq = &state->reqs[state->top_req];
 574
 575                 if (tevent_req_is_in_progress(top_subreq->req)) {
 576                         DEBUG(11, ("cli_pull_read_done: top request not yet "
 577                                    "done\n"));
 578                         return;
 579                 }
 580
 581                 DEBUG(10, ("cli_pull_read_done: Pushing %d bytes, %d already "
 582                            "pushed\n", (int)top_subreq->received,
 583                            (int)state->pushed));
 584
 585                 status = state->sink((char *)top_subreq->buf,
 586                                      top_subreq->received, state->priv);
 587                 if (tevent_req_nterror(state->req, status)) {
 588                         return;
 589                 }
 590                 state->pushed += top_subreq->received;
 591
 592                 TALLOC_FREE(state->reqs[state->top_req].req);
 593
 594                 if (state->requested < state->size) {
 595                         struct tevent_req *new_req;
 596                         SMB_OFF_T size_left;
 597                         size_t request_thistime;
 598
 599                         size_left = state->size - state->requested;
 600                         request_thistime = MIN(size_left, state->chunk_size);
 601
 602                         DEBUG(10, ("cli_pull_read_done: Requesting %d bytes "
 603                                    "at %d, position %d\n",
 604                                    (int)request_thistime,
 605                                    (int)(state->start_offset
 606                                          + state->requested),
 607                                    state->top_req));
 608
 609                         new_req = cli_readall_send(
 610                                 state->reqs, state->ev, state->cli,
 611                                 state->fnum,
 612                                 state->start_offset + state->requested,
 613                                 request_thistime);
 614
 615                         if (tevent_req_nomem(new_req, state->req)) {
 616                                 return;
 617                         }
 618                         tevent_req_set_callback(new_req, cli_pull_read_done,
 619                                                 req);
 620
 621                         state->reqs[state->top_req].req = new_req;
 622                         state->requested += request_thistime;
 623                 }
 624
 625                 state->top_req = (state->top_req+1) % state->num_reqs;
 626         }
 627
 628         tevent_req_done(req);
 629 }
 630
 631 NTSTATUS cli_pull_recv(struct tevent_req *req, SMB_OFF_T *received)
 632 {
 633         struct cli_pull_state *state = tevent_req_data(
 634                 req, struct cli_pull_state);
 635         NTSTATUS status;
 636
 637         if (tevent_req_is_nterror(req, &status)) {
 638                 return status;
 639         }
 640         *received = state->pushed;
 641         return NT_STATUS_OK;
 642 }
 643
 644 NTSTATUS cli_pull(struct cli_state *cli, uint16_t fnum,
 645                   off_t start_offset, SMB_OFF_T size, size_t window_size,
 646                   NTSTATUS (*sink)(char *buf, size_t n, void *priv),
 647                   void *priv, SMB_OFF_T *received)
 648 {
 649         TALLOC_CTX *frame = talloc_stackframe();
 650         struct event_context *ev;
 651         struct tevent_req *req;
 652         NTSTATUS status = NT_STATUS_OK;
 653
 654         if (cli_has_async_calls(cli)) {
 655                 /*
 656                  * Can't use sync call while an async call is in flight
 657                  */
 658                 status = NT_STATUS_INVALID_PARAMETER;
 659                 goto fail;
 660         }
 661
 662         ev = event_context_init(frame);
 663         if (ev == NULL) {
 664                 status = NT_STATUS_NO_MEMORY;
 665                 goto fail;
 666         }
 667
 668         req = cli_pull_send(frame, ev, cli, fnum, start_offset, size,
 669                             window_size, sink, priv);
 670         if (req == NULL) {
 671                 status = NT_STATUS_NO_MEMORY;
 672                 goto fail;
 673         }
 674
 675         if (!tevent_req_poll(req, ev)) {
 676                 status = map_nt_error_from_unix(errno);
 677                 goto fail;
 678         }
 679
 680         status = cli_pull_recv(req, received);
 681  fail:
 682         TALLOC_FREE(frame);
 683         return status;
 684 }
 685
 686 static NTSTATUS cli_read_sink(char *buf, size_t n, void *priv)
 687 {
 688         char **pbuf = (char **)priv;
 689         memcpy(*pbuf, buf, n);
 690         *pbuf += n;
 691         return NT_STATUS_OK;
 692 }
 693
 694 NTSTATUS cli_read(struct cli_state *cli, uint16_t fnum,
 695                  char *buf, off_t offset, size_t size,
 696                  size_t *nread)
 697 {
 698         NTSTATUS status;
 699         SMB_OFF_T ret;
 700
 701         status = cli_pull(cli, fnum, offset, size, size,
 702                           cli_read_sink, &buf, &ret);
 703         if (!NT_STATUS_IS_OK(status)) {
 704                 return status;
 705         }
 706
 707         if (nread) {
 708                 *nread = ret;
 709         }
 710
 711         return NT_STATUS_OK;
 712 }
 713
 714 /****************************************************************************
 715   write to a file using a SMBwrite and not bypassing 0 byte writes
 716 ****************************************************************************/
 717
 718 NTSTATUS cli_smbwrite(struct cli_state *cli, uint16_t fnum, char *buf,
 719                       off_t offset, size_t size1, size_t *ptotal)
 720 {
 721         uint8_t *bytes;
 722         ssize_t total = 0;
 723
 724         /*
 725          * 3 bytes prefix
 726          */
 727
 728         bytes = talloc_array(talloc_tos(), uint8_t, 3);
 729         if (bytes == NULL) {
 730                 return NT_STATUS_NO_MEMORY;
 731         }
 732         bytes[0] = 1;
 733
 734         do {
 735                 size_t size = MIN(size1, cli->max_xmit - 48);
 736                 struct tevent_req *req;
 737                 uint16_t vwv[5];
 738                 uint16_t *ret_vwv;
 739                 NTSTATUS status;
 740
 741                 SSVAL(vwv+0, 0, fnum);
 742                 SSVAL(vwv+1, 0, size);
 743                 SIVAL(vwv+2, 0, offset);
 744                 SSVAL(vwv+4, 0, 0);
 745
 746                 bytes = talloc_realloc(talloc_tos(), bytes, uint8_t,
 747                                              size+3);
 748                 if (bytes == NULL) {
 749                         return NT_STATUS_NO_MEMORY;
 750                 }
 751                 SSVAL(bytes, 1, size);
 752                 memcpy(bytes + 3, buf + total, size);
 753
 754                 status = cli_smb(talloc_tos(), cli, SMBwrite, 0, 5, vwv,
 755                                  size+3, bytes, &req, 1, NULL, &ret_vwv,
 756                                  NULL, NULL);
 757                 if (!NT_STATUS_IS_OK(status)) {
 758                         TALLOC_FREE(bytes);
 759                         return status;
 760                 }
 761
 762                 size = SVAL(ret_vwv+0, 0);
 763                 TALLOC_FREE(req);
 764                 if (size == 0) {
 765                         break;
 766                 }
 767                 size1 -= size;
 768                 total += size;
 769                 offset += size;
 770
 771         } while (size1);
 772
 773         TALLOC_FREE(bytes);
 774
 775         if (ptotal != NULL) {
 776                 *ptotal = total;
 777         }
 778         return NT_STATUS_OK;
 779 }
 780
 781 /*
 782  * Send a write&x request
 783  */
 784
 785 struct cli_write_andx_state {
 786         size_t size;
 787         uint16_t vwv[14];
 788         size_t written;
 789         uint8_t pad;
 790         struct iovec iov[2];
 791 };
 792
 793 static void cli_write_andx_done(struct tevent_req *subreq);
 794
 795 struct tevent_req *cli_write_andx_create(TALLOC_CTX *mem_ctx,
 796                                          struct event_context *ev,
 797                                          struct cli_state *cli, uint16_t fnum,
 798                                          uint16_t mode, const uint8_t *buf,
 799                                          off_t offset, size_t size,
 800                                          struct tevent_req **reqs_before,
 801                                          int num_reqs_before,
 802                                          struct tevent_req **psmbreq)
 803 {
 804         struct tevent_req *req, *subreq;
 805         struct cli_write_andx_state *state;
 806         bool bigoffset = ((cli->capabilities & CAP_LARGE_FILES) != 0);
 807         uint8_t wct = bigoffset ? 14 : 12;
 808         size_t max_write = cli_write_max_bufsize(cli, mode, wct);
 809         uint16_t *vwv;
 810
 811         req = tevent_req_create(mem_ctx, &state, struct cli_write_andx_state);
 812         if (req == NULL) {
 813                 return NULL;
 814         }
 815
 816         size = MIN(size, max_write);
 817
 818         vwv = state->vwv;
 819
 820         SCVAL(vwv+0, 0, 0xFF);
 821         SCVAL(vwv+0, 1, 0);
 822         SSVAL(vwv+1, 0, 0);
 823         SSVAL(vwv+2, 0, fnum);
 824         SIVAL(vwv+3, 0, offset);
 825         SIVAL(vwv+5, 0, 0);
 826         SSVAL(vwv+7, 0, mode);
 827         SSVAL(vwv+8, 0, 0);
 828         SSVAL(vwv+9, 0, (size>>16));
 829         SSVAL(vwv+10, 0, size);
 830
 831         SSVAL(vwv+11, 0,
 832               cli_smb_wct_ofs(reqs_before, num_reqs_before)
 833               + 1               /* the wct field */
 834               + wct * 2         /* vwv */
 835               + 2               /* num_bytes field */
 836               + 1               /* pad */);
 837
 838         if (bigoffset) {
 839                 SIVAL(vwv+12, 0, (((uint64_t)offset)>>32) & 0xffffffff);
 840         }
 841
 842         state->pad = 0;
 843         state->iov[0].iov_base = (void *)&state->pad;
 844         state->iov[0].iov_len = 1;
 845         state->iov[1].iov_base = discard_const_p(void, buf);
 846         state->iov[1].iov_len = size;
 847
 848         subreq = cli_smb_req_create(state, ev, cli, SMBwriteX, 0, wct, vwv,
 849                                     2, state->iov);
 850         if (tevent_req_nomem(subreq, req)) {
 851                 return tevent_req_post(req, ev);
 852         }
 853         tevent_req_set_callback(subreq, cli_write_andx_done, req);
 854         *psmbreq = subreq;
 855         return req;
 856 }
 857
 858 struct tevent_req *cli_write_andx_send(TALLOC_CTX *mem_ctx,
 859                                        struct event_context *ev,
 860                                        struct cli_state *cli, uint16_t fnum,
 861                                        uint16_t mode, const uint8_t *buf,
 862                                        off_t offset, size_t size)
 863 {
 864         struct tevent_req *req, *subreq;
 865         NTSTATUS status;
 866
 867         req = cli_write_andx_create(mem_ctx, ev, cli, fnum, mode, buf, offset,
 868                                     size, NULL, 0, &subreq);
 869         if (req == NULL) {
 870                 return NULL;
 871         }
 872
 873         status = cli_smb_req_send(subreq);
 874         if (tevent_req_nterror(req, status)) {
 875                 return tevent_req_post(req, ev);
 876         }
 877         return req;
 878 }
 879
 880 static void cli_write_andx_done(struct tevent_req *subreq)
 881 {
 882         struct tevent_req *req = tevent_req_callback_data(
 883                 subreq, struct tevent_req);
 884         struct cli_write_andx_state *state = tevent_req_data(
 885                 req, struct cli_write_andx_state);
 886         uint8_t wct;
 887         uint16_t *vwv;
 888         uint8_t *inbuf;
 889         NTSTATUS status;
 890
 891         status = cli_smb_recv(subreq, state, &inbuf, 6, &wct, &vwv,
 892                               NULL, NULL);
 893         TALLOC_FREE(subreq);
 894         if (NT_STATUS_IS_ERR(status)) {
 895                 tevent_req_nterror(req, status);
 896                 return;
 897         }
 898         state->written = SVAL(vwv+2, 0);
 899         state->written |= SVAL(vwv+4, 0)<<16;
 900         tevent_req_done(req);
 901 }
 902
 903 NTSTATUS cli_write_andx_recv(struct tevent_req *req, size_t *pwritten)
 904 {
 905         struct cli_write_andx_state *state = tevent_req_data(
 906                 req, struct cli_write_andx_state);
 907         NTSTATUS status;
 908
 909         if (tevent_req_is_nterror(req, &status)) {
 910                 return status;
 911         }
 912         if (pwritten != 0) {
 913                 *pwritten = state->written;
 914         }
 915         return NT_STATUS_OK;
 916 }
 917
 918 struct cli_writeall_state {
 919         struct event_context *ev;
 920         struct cli_state *cli;
 921         uint16_t fnum;
 922         uint16_t mode;
 923         const uint8_t *buf;
 924         off_t offset;
 925         size_t size;
 926         size_t written;
 927 };
 928
 929 static void cli_writeall_written(struct tevent_req *req);
 930
 931 static struct tevent_req *cli_writeall_send(TALLOC_CTX *mem_ctx,
 932                                             struct event_context *ev,
 933                                             struct cli_state *cli,
 934                                             uint16_t fnum,
 935                                             uint16_t mode,
 936                                             const uint8_t *buf,
 937                                             off_t offset, size_t size)
 938 {
 939         struct tevent_req *req, *subreq;
 940         struct cli_writeall_state *state;
 941
 942         req = tevent_req_create(mem_ctx, &state, struct cli_writeall_state);
 943         if (req == NULL) {
 944                 return NULL;
 945         }
 946         state->ev = ev;
 947         state->cli = cli;
 948         state->fnum = fnum;
 949         state->mode = mode;
 950         state->buf = buf;
 951         state->offset = offset;
 952         state->size = size;
 953         state->written = 0;
 954
 955         subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
 956                                      state->mode, state->buf, state->offset,
 957                                      state->size);
 958         if (tevent_req_nomem(subreq, req)) {
 959                 return tevent_req_post(req, ev);
 960         }
 961         tevent_req_set_callback(subreq, cli_writeall_written, req);
 962         return req;
 963 }
 964
 965 static void cli_writeall_written(struct tevent_req *subreq)
 966 {
 967         struct tevent_req *req = tevent_req_callback_data(
 968                 subreq, struct tevent_req);
 969         struct cli_writeall_state *state = tevent_req_data(
 970                 req, struct cli_writeall_state);
 971         NTSTATUS status;
 972         size_t written, to_write;
 973
 974         status = cli_write_andx_recv(subreq, &written);
 975         TALLOC_FREE(subreq);
 976         if (tevent_req_nterror(req, status)) {
 977                 return;
 978         }
 979
 980         state->written += written;
 981
 982         if (state->written > state->size) {
 983                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 984                 return;
 985         }
 986
 987         to_write = state->size - state->written;
 988
 989         if (to_write == 0) {
 990                 tevent_req_done(req);
 991                 return;
 992         }
 993
 994         subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
 995                                      state->mode,
 996                                      state->buf + state->written,
 997                                      state->offset + state->written, to_write);
 998         if (tevent_req_nomem(subreq, req)) {
 999                 return;
1000         }
1001         tevent_req_set_callback(subreq, cli_writeall_written, req);
1002 }
1003
1004 static NTSTATUS cli_writeall_recv(struct tevent_req *req,
1005                                   size_t *pwritten)
1006 {
1007         struct cli_writeall_state *state = tevent_req_data(
1008                 req, struct cli_writeall_state);
1009         NTSTATUS status;
1010
1011         if (tevent_req_is_nterror(req, &status)) {
1012                 return status;
1013         }
1014         if (pwritten != NULL) {
1015                 *pwritten = state->written;
1016         }
1017         return NT_STATUS_OK;
1018 }
1019
1020 NTSTATUS cli_writeall(struct cli_state *cli, uint16_t fnum, uint16_t mode,
1021                       const uint8_t *buf, off_t offset, size_t size,
1022                       size_t *pwritten)
1023 {
1024         TALLOC_CTX *frame = talloc_stackframe();
1025         struct event_context *ev;
1026         struct tevent_req *req;
1027         NTSTATUS status = NT_STATUS_NO_MEMORY;
1028
1029         if (cli_has_async_calls(cli)) {
1030                 /*
1031                  * Can't use sync call while an async call is in flight
1032                  */
1033                 status = NT_STATUS_INVALID_PARAMETER;
1034                 goto fail;
1035         }
1036         ev = event_context_init(frame);
1037         if (ev == NULL) {
1038                 goto fail;
1039         }
1040         req = cli_writeall_send(frame, ev, cli, fnum, mode, buf, offset, size);
1041         if (req == NULL) {
1042                 goto fail;
1043         }
1044         if (!tevent_req_poll(req, ev)) {
1045                 status = map_nt_error_from_unix(errno);
1046                 goto fail;
1047         }
1048         status = cli_writeall_recv(req, pwritten);
1049  fail:
1050         TALLOC_FREE(frame);
1051         return status;
1052 }
1053
1054 struct cli_push_write_state {
1055         struct tevent_req *req;/* This is the main request! Not the subreq */
1056         uint32_t idx;
1057         off_t ofs;
1058         uint8_t *buf;
1059         size_t size;
1060 };
1061
1062 struct cli_push_state {
1063         struct event_context *ev;
1064         struct cli_state *cli;
1065         uint16_t fnum;
1066         uint16_t mode;
1067         off_t start_offset;
1068         size_t window_size;
1069
1070         size_t (*source)(uint8_t *buf, size_t n, void *priv);
1071         void *priv;
1072
1073         bool eof;
1074
1075         size_t chunk_size;
1076         off_t next_offset;
1077
1078         /*
1079          * Outstanding requests
1080          */
1081         uint32_t pending;
1082         uint32_t num_reqs;
1083         struct cli_push_write_state **reqs;
1084 };
1085
1086 static void cli_push_written(struct tevent_req *req);
1087
1088 static bool cli_push_write_setup(struct tevent_req *req,
1089                                  struct cli_push_state *state,
1090                                  uint32_t idx)
1091 {
1092         struct cli_push_write_state *substate;
1093         struct tevent_req *subreq;
1094
1095         substate = talloc(state->reqs, struct cli_push_write_state);
1096         if (!substate) {
1097                 return false;
1098         }
1099         substate->req = req;
1100         substate->idx = idx;
1101         substate->ofs = state->next_offset;
1102         substate->buf = talloc_array(substate, uint8_t, state->chunk_size);
1103         if (!substate->buf) {
1104                 talloc_free(substate);
1105                 return false;
1106         }
1107         substate->size = state->source(substate->buf,
1108                                        state->chunk_size,
1109                                        state->priv);
1110         if (substate->size == 0) {
1111                 state->eof = true;
1112                 /* nothing to send */
1113                 talloc_free(substate);
1114                 return true;
1115         }
1116
1117         subreq = cli_writeall_send(substate,
1118                                    state->ev, state->cli,
1119                                    state->fnum, state->mode,
1120                                    substate->buf,
1121                                    substate->ofs,
1122                                    substate->size);
1123         if (!subreq) {
1124                 talloc_free(substate);
1125                 return false;
1126         }
1127         tevent_req_set_callback(subreq, cli_push_written, substate);
1128
1129         state->reqs[idx] = substate;
1130         state->pending += 1;
1131         state->next_offset += substate->size;
1132
1133         return true;
1134 }
1135
1136 struct tevent_req *cli_push_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
1137                                  struct cli_state *cli,
1138                                  uint16_t fnum, uint16_t mode,
1139                                  off_t start_offset, size_t window_size,
1140                                  size_t (*source)(uint8_t *buf, size_t n,
1141                                                   void *priv),
1142                                  void *priv)
1143 {
1144         struct tevent_req *req;
1145         struct cli_push_state *state;
1146         uint32_t i;
1147
1148         req = tevent_req_create(mem_ctx, &state, struct cli_push_state);
1149         if (req == NULL) {
1150                 return NULL;
1151         }
1152         state->cli = cli;
1153         state->ev = ev;
1154         state->fnum = fnum;
1155         state->start_offset = start_offset;
1156         state->mode = mode;
1157         state->source = source;
1158         state->priv = priv;
1159         state->eof = false;
1160         state->pending = 0;
1161         state->next_offset = start_offset;
1162
1163         state->chunk_size = cli_write_max_bufsize(cli, mode, 14);
1164
1165         if (window_size == 0) {
1166                 window_size = cli->max_mux * state->chunk_size;
1167         }
1168         state->num_reqs = window_size/state->chunk_size;
1169         if ((window_size % state->chunk_size) > 0) {
1170                 state->num_reqs += 1;
1171         }
1172         state->num_reqs = MIN(state->num_reqs, cli->max_mux);
1173         state->num_reqs = MAX(state->num_reqs, 1);
1174
1175         state->reqs = talloc_zero_array(state, struct cli_push_write_state *,
1176                                         state->num_reqs);
1177         if (state->reqs == NULL) {
1178                 goto failed;
1179         }
1180
1181         for (i=0; i<state->num_reqs; i++) {
1182                 if (!cli_push_write_setup(req, state, i)) {
1183                         goto failed;
1184                 }
1185
1186                 if (state->eof) {
1187                         break;
1188                 }
1189         }
1190
1191         if (state->pending == 0) {
1192                 tevent_req_done(req);
1193                 return tevent_req_post(req, ev);
1194         }
1195
1196         return req;
1197
1198  failed:
1199         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1200         return tevent_req_post(req, ev);
1201 }
1202
1203 static void cli_push_written(struct tevent_req *subreq)
1204 {
1205         struct cli_push_write_state *substate = tevent_req_callback_data(
1206                 subreq, struct cli_push_write_state);
1207         struct tevent_req *req = substate->req;
1208         struct cli_push_state *state = tevent_req_data(
1209                 req, struct cli_push_state);
1210         NTSTATUS status;
1211         uint32_t idx = substate->idx;
1212
1213         state->reqs[idx] = NULL;
1214         state->pending -= 1;
1215
1216         status = cli_writeall_recv(subreq, NULL);
1217         TALLOC_FREE(subreq);
1218         TALLOC_FREE(substate);
1219         if (tevent_req_nterror(req, status)) {
1220                 return;
1221         }
1222
1223         if (!state->eof) {
1224                 if (!cli_push_write_setup(req, state, idx)) {
1225                         tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1226                         return;
1227                 }
1228         }
1229
1230         if (state->pending == 0) {
1231                 tevent_req_done(req);
1232                 return;
1233         }
1234 }
1235
1236 NTSTATUS cli_push_recv(struct tevent_req *req)
1237 {
1238         return tevent_req_simple_recv_ntstatus(req);
1239 }
1240
1241 NTSTATUS cli_push(struct cli_state *cli, uint16_t fnum, uint16_t mode,
1242                   off_t start_offset, size_t window_size,
1243                   size_t (*source)(uint8_t *buf, size_t n, void *priv),
1244                   void *priv)
1245 {
1246         TALLOC_CTX *frame = talloc_stackframe();
1247         struct event_context *ev;
1248         struct tevent_req *req;
1249         NTSTATUS status = NT_STATUS_OK;
1250
1251         if (cli_has_async_calls(cli)) {
1252                 /*
1253                  * Can't use sync call while an async call is in flight
1254                  */
1255                 status = NT_STATUS_INVALID_PARAMETER;
1256                 goto fail;
1257         }
1258
1259         ev = event_context_init(frame);
1260         if (ev == NULL) {
1261                 status = NT_STATUS_NO_MEMORY;
1262                 goto fail;
1263         }
1264
1265         req = cli_push_send(frame, ev, cli, fnum, mode, start_offset,
1266                             window_size, source, priv);
1267         if (req == NULL) {
1268                 status = NT_STATUS_NO_MEMORY;
1269                 goto fail;
1270         }
1271
1272         if (!tevent_req_poll(req, ev)) {
1273                 status = map_nt_error_from_unix(errno);
1274                 goto fail;
1275         }
1276
1277         status = cli_push_recv(req);
1278  fail:
1279         TALLOC_FREE(frame);
1280         return status;
1281 }